CHIRALITY ASSISTED MAGNETIZATION PRECESSION AND SWITCHING
Abstract
The project focuses on investigations of spin-orbit-torque (SOT) driven bias-free switching and persistent oscillations of magnetization of a perpendicular magnetic anisotropy (PMA) metallic ferromagnet. The sources of spin currents will be an emergent class of chiral antiferromagnetic/ferrimagnetic compounds and adsorbate-tuned heavy metals (HM) with strong spin orbit coupling. The chiral magnets of interest are compounds such as Mn3Sn, Mn3Ge and Heusler alloys of the Mn2YZ class where Y and Z are heavy elements with strong intra-atomic spin-orbit coupling. The magnetically driven spin Hall effect in such materials is expected to generate a spin current whose polarization is collinear with the magnetic moment of the PMA film. The spin-charge separation characteristics of these heterostructures will be quantified through the measurements of inverse spin Hall effect (ISHE) in microwave-driven spin pumping experiments. Metallic multilayers of proven technological importance, such as [Co/Ni]n with PMA and soft magnetic characteristics will be deposited on top of the chiral magnet for bias-free switching experiments. The SOT on these multilayers will be augmented by placing an HM film of the correct Hall angle on top of the stack. We also propose to explore the effect of gaseous adsorbates such as nitrogen and oxygen molecules at the interface of the PMA multilayer and HM film on the switching characteristics. Independent experiments will be carried out to address the potential enhancement in SOT due to gaseous adsorbates at the interface of HM and [Co/Ni]n.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Apr 20, 2023
- Source ID
- FA95502210392
Entities
People
- R. C. Budhani
Organizations
- Air Force Office of Scientific Research
- Morgan State University
- United States Air Force